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ICeo(ogunlTechmcs Inc Page 3 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> June 4, 1999 <br /> A chain of custody document, listing all samples collected and their intended analyses, <br /> I accompanied the samples from field to the laboratory, thereby providing a means to track _ <br /> their movement and insure their integrity <br /> 1.3 Laboratory Analyses <br /> The groundwater samples collected on January 25, 1999 were delivered to BSK Labs of <br /> Fresno, California Due to a heavy workload, the samples were sub-contracted out to Castle <br /> Analytical Laboratory of Atwater, California (certification #2079) for analysis of <br /> • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by method EPA method 602 <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> • Methyl Tertiary Butyl Ether (MTBE) by EPA method 602 <br />' The detection limits for the above analyses are listed in Table 2 of Appendix A while the lab <br /> analytical results are presented in Appendix B <br /> 2.0 FINDINGS AND DISCUSSION <br />' The results of the groundwater sample analysis show the following <br /> • BTEX and TPH-G concentrations increased significantly in MW-2 but remained <br />' relatively consistent with past events in the other five wells <br /> • High levels of BTEX and TPH-G compounds are present in all six monitoring wells <br /> • MTBE was not detected in the water samples from any of the wells <br />' <br /> During field monitoring/well purging work, water quality parameters were measured <br />' including Oxidation-Reduction Potential (ORP) The ORP results show a direct correlation <br /> of negative values for wells in the contaminated zone Thus suggesting that natural <br /> biodegradation of these chemicals is not a significant attenuation process To date, no wells <br />' are located outside the contaminated zone <br /> The County for the installation of a deep well has approved a work plan A cost pre-approval <br />' has been submitted to the USTCFP for this work <br />' 3.0 LIMITATIONS <br /> This report was prepared in accordance with the accepted standards and practices of the <br />' field of environmental geology, groundwater hydrology and good business practices It <br /> should be recognized that definition and evaluation of environmental conditions is a <br /> 1 <br />